Dynamic active wave plate using random nanoparticles

Park, Jung Hoon; Park, Chunghyun; Yu, Hyunseung; Cho, Yong-Hoon; Park, YongKeun

doi:10.1364/oe.20.017010

Cited by 84 publications

(67 citation statements)

References 29 publications

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“…We anticipate that the further improvement of the measurement speed of the present can be accomplished with a field programmable gate array (FPGA) processing a graphics process unit (GPU), and this set up will lead to widespread applications of wavefront shaping approaches in OCT. Furthermore, the present method can also be expanded to other OCT modalities such as polarization-sensitive or spectroscopic signals, by exploiting large degree of freedoms in multiple scattering 21,35,36 . …”

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confidence: 99%

In vivodeep tissue imaging using wavefront shaping optical coherence tomography

Lee

et al. 2016

J. Biomed. Opt

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Abstract. Multiple light scattering in tissue limits the penetration of optical coherence tomography (OCT) imaging. Here, we present in-vivo OCT imaging of a live mouse using wavefront shaping to enhance the penetration depth. A digital micro-mirror device (DMD) was used in a spectral-domain OCT system for complex wavefront shaping of an incident beam which resulted in the optimal delivery of light energy into deep tissue. Ex-vivo imaging of chicken breasts and mouse ear tissues showed enhancements in the strength of the image signals and the penetration depth, and in-vivo imaging of the tail of a live mouse provided a multilayered structure inside the tissue, otherwise invisible in conventional OCT imaging. Signal enhancements by a factor of 3−7 were acquired for various experimental conditions and samples.

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confidence: 99%

In vivodeep tissue imaging using wavefront shaping optical coherence tomography

Lee

et al. 2016

J. Biomed. Opt

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“…This enables the use of complex optical elements as a dynamic wave plate 42) , a spectral filter 43) , and the control of spatiotemporal profile of light 44 The realization of an interferometry-based imaging system is complicated, compared to a photographic camera. Because coherence light must be divided into a sample and a reference beam to construct an interferometer, an optical instrument becomes large and complicated, and precise and stable experimental conditions are strongly required 50) .…”

Section: Practical Consideration Of Transmission Matricesmentioning

confidence: 99%

[Invited Paper] Review: 3D Holographic Imaging and Display Exploiting Complex Optics

Baek

Park

et al. 2017

MTA

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Recently, the developments of electronic devices such as a charge-coupled device (CCD) or a spatial light modulator (SLM) have enabled digital holography techniques 12)-14) .Since digital holography takes advantages in recording, reading, and transferring of dynamic optical field information, it has been extended into various fields such as biomedical optics 15) 16) , holographic microscopy 17)-19) , 3D display 20) , data storage 21) and security 22) .Although digital holography for recording and displaying of 3D optical information has potentially interesting applications, its implementation has been limited to mostly laboratory-level demonstrations because of the requirement for a bulky interferometric setup and a limited space-bandwidth product (SBP) of SLMs in holographic displays.In 3D holographic imaging technique, portability would be crucial for practical applications. However, the need for a reference beam in conventional interferometry significantly limits the realization of a portable device.In 3D holographic display, 3D optical fields are generated by a spatial light modulator. The product of the image size and the viewing angle is directly proportional to the number of controllable optical modes, or an SBP of an SLM 23) . Since the current state-of-art Abstract Digital holography has high potentials for future 3D imaging and display technology. Due to the capability of recording and projecting realistic 3D images, holography has been extensively studied for decades.However, the requirement of a reference beam in interferometric systems and a limited number of pixels in existing spatial light modulators have been major obstacles for the practical applications of 3D holography technology. Recently, the field of wavefront shaping, or the study of controlling multiple scattering of light, has emerged with numerous interesting applications in digital holography. In this review, we introduce the principles of multiple light scattering in complex media and highlight recent achievements to overcome the limitation in conventional 3D holography by exploiting multiple light scattering. The complexity of multiple light scattering, which had been regarded as a major barrier for conventional optical systems, can provide referencefree 3D holographic imaging and 3D holographic display with several advantages.

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“…These wave-shaping methods remarkably enhance the intensity in a single speckle as well as the total reflected and transmitted intensity. The wave-shaping methods have led the way for exciting applications such as non-invasive biomedical imaging [21][22][23], advanced optics [24][25][26][27][28][29], and cryptography and secure communication [30,31].…”

Section: Introductionmentioning

confidence: 99%

Mapping the energy density of shaped waves in scattering media onto a complete set of diffusion modes

Ojambati¹,

Mosk²,

Vellekoop³

et al. 2016

Opt. Express

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Abstract:We show that the spatial distribution of the energy density of optimally shaped waves inside a scattering medium can be described by considering only a few of the lowest eigenfunctions of the diffusion equation. Taking into account only the fundamental eigenfunction, the total internal energy inside the sample is underestimated by only 2%. The spatial distribution of the shaped energy density is very similar to the fundamental eigenfunction, up to a cosine distance of about 0.01. We obtained the energy density inside a quasi-1D disordered waveguide by numerical calculation of the joined scattering matrix. Computing the transmission-averaged energy density over all transmission channels yields the ensemble averaged energy density of shaped waves. From the averaged energy density obtained, we reconstruct its spatial distribution using the eigenfunctions of the diffusion equation. The results from our study have exciting applications in controlled biomedical imaging, efficient light harvesting in solar cells, enhanced energy conversion in solid-state lighting, and low threshold random lasers.

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Dynamic active wave plate using random nanoparticles

Cited by 84 publications

References 29 publications

In vivodeep tissue imaging using wavefront shaping optical coherence tomography

In vivodeep tissue imaging using wavefront shaping optical coherence tomography

[Invited Paper] Review: 3D Holographic Imaging and Display Exploiting Complex Optics

Mapping the energy density of shaped waves in scattering media onto a complete set of diffusion modes

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